Plant microbial fuel cells (PMFCs) are electrochemical systems capable of producing electrical energy from plant growth. Despite their limited power density, PMFCs hold pomise as power source for ...wireless sensor, without using embedded battery, especially in isolated locations. In this study, a complete wireless system was presented, with Cyperus papyrus-based microbial fuel cell. The Cyperus papyrus system was studied over 900 days. Although there was a slight decrease in power output attributed to anodic decreasing performance, the reduction at the cathode remained stable. This stability is likely due to biocatalyst activity, supported by the oxygen transport from the plant to the roots. Although performance of Cyperus papyrus microbial fuel cell were lower than those found in literature, these plants were stacked to power a microcontroller equipped with a temperature/humidity sensor. This microcontroller transmitted measurements wirelessly to a web server every 2 h. The web server, accessible via a web interface, provided real-time data to users on the local network. Finally, the intervals between measurements could serve as indicators of environmental stress, such as variations in soil moisture content.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Plant Microbial Fuel Cell (PMFC) creates electricity from oxidation of root exudates by microbia anaerobic digestion, and reduction of dioxygen to water. In this study, Lobelia Queen Cardinalis was ...used as a plant model to investigate the impact of ionic connection between stacked Plant microbial fuel cell (shared soil). 10mm thickness carbon felt woven with stainless steel wire was used for both anode and cathode, and soil was a mix of potting soil and ground from pond banks (30\%-70\% weight, respectively). Independent performances did not show any difference between individual and shared soil PMFCs. Stacking independent PMFC in series sums both open circuit potential (OCP) and internal resistance, while stacking in parallel sums current, keeping open circuit potential to the mean of the OCPs. Although series stacking seems to output best performances, this configuration may cause voltage reversal in one PMFC when current is strong, leading to biofilm damage, so stacking in parallel is recommended.
In this study, the relationship between pyrolysis temperature of woody biomass and physicochemical properties of derived biochar was investigated for microbial fuel cell (MFC) application. Physical ...and chemical properties of biochar were characterized for different pyrolysis temperatures. Results showed that biochar obtained at 400 °C was not conductor, while biochars prepared at 600 °C, 700 °C, and 900 °C exhibited decreased electrical resistivity of (7 ± 6) × 10
3
Ω.m, (1.8 ± 0.2) Ω.m, and (16 ± 3) × 10
−3
Ω.m, respectively. Rising pyrolysis temperature from 400 to 700 °C exhibited honeycomb-like macroporous structures of biochar with an increase in the specific surface area from 310 to 484 m
2
.g
−1
. However, the production of biochar at 900 °C reduced its specific surface area to 136 m
2
.g
−1
and caused the loss of the ordered honeycomb structure. MFCs using anodes based on biochar prepared at 900 °C produced maximum power densities ((9.9 ± 0.6) mW.m
−2
) higher than that obtained with biochar pyrolyzed at 700 °C ((5.8 ± 0.1) mW.m
−2
) and with conventional carbon felt anodes ((1.9 ± 0.2) mW.m
−2
). SEM images of biochar-based anodes indicated the clogging of macropores in honeycomb structure of biochar prepared at 700 °C by growth of electroactive biofilms, which might impede the supply of substrate and the removal of metabolites from the inside of the electrode. These findings highlight that electrical conductivity of biochar is the major parameter for ensuring efficient anodes in microbial fuel cell application.
Graphical abstract
Schematic representation of cedar wood-based biochar and its application as anode in MFC.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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